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<h2>DAS registry help - capabilities</h2>

<p>



<p>
A <b>DAS capability</b> is a particular DAS command that can be understood by a DAS source.
These commands are being defined by the <a href="http://biodas.org/documents/spec.html">DAS specification</a> 
(version 1.5) and by the <a href="help_extensions.jsp">alignment & structure DAS extension</a> (version 1.1)
</p>

<p>
The DAS registration server ensures that the DAS sources "speak" the correct DAS language. 
It <a href="help_validation.jsp">validates</a> all DAS sources every two hours to ensure they 
are still available.
</p>

The following DAS capabilities are supported:


    To retrieve <b>reference objects</b> to which annotations are attached:
    <ul>
       <li><a href="http://biodas.org/documents/spec.html#sequence">sequence</a> - 
       retrieve a sequence </li>

       <li><a href="extension_structure.jsp">structure</a> - 
       retrieve a structure </li>
       
       <li><a href="http://biodas.org/documents/spec.html#entry">entry_points</a> - 
       get the entry points of a DAS source </li>
    </ul>


    to retrieve <b>annotations</b>
    <ul>
	<li><a href="http://biodas.org/documents/spec.html#features">features</a> - 
	get the annotations for a reference object</li>
	<li><a href="http://biodas.org/documents/spec.html#types">types</a> - 
	get the available types of annotation of a DAS source</li>	
    </ul>

    to provide the <b>relationship</b> (alignment/mapping)
    between two objects, which can be in different <a href="help_coordsys.jsp">coordinate systems</a>:
    <ul>
    	<li><a href="extension_alignment.jsp">alignment</a> - 
	get the mapping of one object (in a particular coordinate system) onto another </li>
    </ul>

    for <b>visualization</b>:    
    <ul>
        <li><a href="http://biodas.org/documents/spec.html#stylesheet">stylesheet</a> - 
	defines how the feautres should be drawn in the visualization client</li>
    </ul>
    
    Other <b>DAS extensions</b>:
    <ul>
    <li><a href="extension_interaction.jsp">interaction</a> - share protein-protein interaction data.
    </li>
    </ul>
    We are currently in the process of adding support for all extensions of the <a href="spec_1.53E.jsp">latest spec</a>.


    

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